Abstract
The voltage disturbances in hot-cathode arcs are markedly affected by a magnetic field transverse to the normal flow of current. The normal plasma oscillations can be suppressed and the noise level above 1 Mc/sec. greatly increased. The oscillations appear to be transmitted to the electrodes by electrons whose velocity is modulated by the plasma ion oscillations as they travel directly from cathode to anode. The effect of the magnetic field is to remove these electrons from the current reaching the anode. A critical value of magnetic field will suppress the oscillations and reduce the noise to a minimum. As the magnetic field is further increased the high frequency noise level increases. The high frequency noise level also increases if the pressure decreases, or if a lighter gas is used. The noise level is independent of the plasma volume. The effect of the magnetic field is to build up a region of high ion density in a narrow region near the electron source. Plasma oscillations with continuous spectrum are generated in this region of high density and high density gradient.
Talk to us
Join us for a 30 min session where you can share your feedback and ask us any queries you have
Schedule a callDisclaimer: All third-party content on this website/platform is and will remain the property of their respective owners and is provided on "as is" basis without any warranties, express or implied. Use of third-party content does not indicate any affiliation, sponsorship with or endorsement by them. Any references to third-party content is to identify the corresponding services and shall be considered fair use under The CopyrightLaw.
